Machine for screw-threading trenails or the like.



No. 7|l,7|6. Patented Oct. 2|, |902.

A. BULLET. MACHINE FOR SEREW THBEADING TBEENAILS OR THE LIKE.

(App lication filed Feb. 16,1901.

(No ModaL) 2 Sheets-Sheet l.

Out/balm,

No. 7Il, 7l6. Patented Oct. 2|, I902.

A. BULLET.

MACHINE FOR SCREW THBEADING TBEEN'AILS 0B THEv LIKE.

- (Application filed Feb. 16, 1901.,

(No Model.) 2 Sheets-Sheet 2.

TV-Ziwssa; ZhveW/Z'm" 737 I 76ZZZ0rney' UNITED STATES PATENT OFFICE.

ALBERT coLLET, or PARIS, FRANCE, ASSIGNORVTO LEO SIMON, OF PARIS, FRANCE.

MACHINE FOR SCREW-THREADING TRENAILS OR THE LIKE.

SPECIFICATION forming part of Letters Patent No. 711,716, dated October 21, 1902.

Application filed February 16, 1901. Serial No. 47,534. (No model.)

To ctZZ whom, it nutty concern:

Be it known that I, ALBERT (lower, a citizen of the French Republic, residing in Paris, France, have invented certain Improvements in Machines for Screw-Threading Trenails or the Like, of which the following is a specification.

This invention relates to a machine for cutpuppets, between which the trenail is mount-' ed, one of said puppets being displaceable for disengaging the finished trenail and allowing another to be placed in position to be operated upon. The carriage is provided with au- 2 5 tomatic disengaging mechanism which frees the trenail at the end of the travel when it has been finished.

To enable the construction and operation of my machine to be fully understood, I willdescribe the same by reference to the accompanying drawings, in which- Figure 1 is a front elevation, partly in section at the left; Fig. 2, a plan, and Fig. 3 a side elevation, of a screw-threadingmachine constructed accordingto my invention. Fig. 4 is a transverse section on the line A B, Fig. 1, showing the tool-covering cap detached: Fig. 5 is a section of the tool and the pulley which drives it. Fig. 6 shows a trenail bored and turned ready to be screw-threaded, and

Fig. 7 shows the trenail screw-threaded.

The machine is constructed of a frame 1, provided with lugs 2 2, on which are pivoted at 3 3 arms4 47, carrying a hollow cap 5, designed to cover the cutting-tool. This cap is provided with a partition 6, serving to form a passage 7 for the discharge of the cuttings which are thrown therein by the turning-tool. The frame 1 carries an arm 8, forming a fixed nut in which works a screw 9, which is rotated by means of a crank-handle 10. The

crank-handle is designed to efiect the move ment of the traveling carriage 11,.provided with the puppets 12 and 13, between which the bored and turned trenail which is to be screw-threaded is secured. The carriage 11 thus has a horizontal forward movement imparted to'it while the puppets 12 and 13 revolve, and thereby rotate the trenail to be screw-threaded.

The tool for cutting the threads in the turned trenail during its double forward and rotating movement consists of a block or mandrel 14, mounted on centers in the cap 5 and carrying three thin gouge-like steel cutters 15 of the concave shape shown in Figs. 4 and 5. These cutters are held on the block 14 by clamps 16, on which press the heads 17 of screws 18, screwed into the block 14:. The block is fixed upon a'spindle 19, carrying the driving-pu1ley20, which is driven from a suitable motor. The working height of the toolcarrier is adjusted by means of a headed screw 21, located in a bracket 22, fixed to the frame 1 andon the end of which the cap 5 rests by its own weight.

As this machine eflects the screw-threading of a trenail at each direction of travel forward as well as backward an automatic device is arranged upon the machine for releasing the screw-threaded trenail. This arrangement consists of a spring-rod 23, provided with an enlarged portion on which the puppet 12 can freely turn. This rod, which slides in a tube 24 fixed to the carriage 11, is provided with a hole in which engages a lever 25 hinged at 26 and connected to a rod 27, having a head 28 moving freely in a tube 29. This tube, moreover, which forms a portion of the frame, carries a projection 30, 0 the function of which will be hereinafter described.

The machine is also provided with an inclined plane 31, fixed to the carriage 11, which at a certain moment raises the cap '5, through 5 the medium of the rod 32, in order to stop the screw-thread at the point 33, Fig. 7, the tool then turning without reaching the shoulder 34 of the trenail.

To screw-thread trenails with this machine, the workman first moves back the carriage 11 so that the bracket 35 comes against the the puppets 12 and 13.

nut 8, and he then places a trenail between The workman then turns the crank-handle from the left toward the right hand in order to cause the screw 9 to work through the nut 8, which causes the puppets the threaded trenail, which falls into a receptacle placed at the foot of the machine. The workman then places a second trenail between the puppets and turns the crank-handle 10 from right to left in order to effect the screw-threading. When the carriage arrives near the end of its travel, the lever encounters the projection and the rod 23 disengages the threaded trenail, which then falls.

Having thus described my invention, I claim- 1. In a machine for screw-threading trenails and the like, the combination with the means for rotating and moving longitudinally the piece to be cut, and the rotating cutters for cutting the thread, of automatic means for disengaging the screw-threaded piece at the end of the cutting operation, said means comprising a displaceable springpuppet which supports one end of the piece, a lever mechanism for withdrawing said puppet, and

means for actuating said lever automatically on said frame and running in a nut thereon,

the said nut, a puppet 13 carried by said screw, a spring-rod 23 mounted slidably on the carriage and provided with a puppet 12, a lever 25 fulcrumed on the carriage, one arm of said lever engaging'said spring-rod, a headed rod 27 coupled to the other arm of said lever and slidable in a cylinder 29 on the frame, and the said cylinder, provided with a detent or stop 36 for the head of the rod 27, and with a detent 30 in the path of the upper arm of said lever, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ALBERT COLLET. 

